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Equity Incentive plan - Stock Option Plan (Details) - Stock Option - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
[1]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, beginning of period 118,458 129,479 [1] 129,479 [1]  
Granted 11,000      
Exercised   (3,306)    
Forfeited   (7,714)    
Outstanding, end of period 129,458 118,458 118,458 129,479
Exercisable, end of period 71,076 47,383    
Weighted-Average Exercise Price Outstanding, beginning $ 5.84 $ 5.84 [1] $ 5.84 [1]  
Weighted average granted 9.38      
Weighted Average Exercise Price per Option, Exercised   5.84    
Weighted Average Exercise Price per Option, Forfeited   5.84    
Weighted Average Exercise Price Options, Outstanding end of period 6.14 5.84 $ 5.84 $ 5.84
Weighted Average Exercise Price per Option, Exercisable at period end $ 5.84 $ 5.84    
Weighted Average Remaining Contractual Term, Options Outstanding 7 years 7 years 9 months 7 years 3 months 8 years 6 months
Weighted Average Remaining Contractual Term, Granted 10 years      
Weighted Average Remaining Contractual Term, Exercisable at end of period 6 years 9 months 7 years 9 months    
Aggregate Intrinsic Value, Options Outstanding (in dollars) $ 367,485 $ 456,416 $ 371,885 $ 194,008
Aggregate Intrinsic Value, Options Exercisable at period end $ 223,179 $ 182,566    
[1] Share amounts related to the periods prior to the January 22, 2020 closing of the conversion offering have been restated to give retroactive recognition to the 1.6351 exchange ratio applied in the conversion offering. (see Note 1).